CN115594346A - Method for treating debugging wastewater in nuclear power construction phase - Google Patents
Method for treating debugging wastewater in nuclear power construction phase Download PDFInfo
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- 239000002351 wastewater Substances 0.000 title claims abstract description 138
- 238000000034 method Methods 0.000 title claims abstract description 56
- 238000010276 construction Methods 0.000 title claims abstract description 32
- 238000006243 chemical reaction Methods 0.000 claims abstract description 75
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 claims abstract description 48
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 48
- 239000000701 coagulant Substances 0.000 claims abstract description 33
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims abstract description 32
- 229910052698 phosphorus Inorganic materials 0.000 claims abstract description 32
- 239000011574 phosphorus Substances 0.000 claims abstract description 32
- 238000004062 sedimentation Methods 0.000 claims abstract description 29
- CWYNVVGOOAEACU-UHFFFAOYSA-N Fe2+ Chemical compound [Fe+2] CWYNVVGOOAEACU-UHFFFAOYSA-N 0.000 claims abstract description 20
- 229910001448 ferrous ion Inorganic materials 0.000 claims abstract description 20
- 230000001590 oxidative effect Effects 0.000 claims abstract description 18
- 239000007800 oxidant agent Substances 0.000 claims abstract description 16
- XKMRRTOUMJRJIA-UHFFFAOYSA-N ammonia nh3 Chemical compound N.N XKMRRTOUMJRJIA-UHFFFAOYSA-N 0.000 claims abstract description 14
- VTLYFUHAOXGGBS-UHFFFAOYSA-N Fe3+ Chemical compound [Fe+3] VTLYFUHAOXGGBS-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229910001447 ferric ion Inorganic materials 0.000 claims abstract description 11
- 239000007788 liquid Substances 0.000 claims abstract description 10
- OAKJQQAXSVQMHS-UHFFFAOYSA-N Hydrazine Chemical compound NN OAKJQQAXSVQMHS-UHFFFAOYSA-N 0.000 claims description 84
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims description 23
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 21
- -1 iron ion Chemical class 0.000 claims description 21
- 229910052742 iron Inorganic materials 0.000 claims description 20
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 15
- 239000010802 sludge Substances 0.000 claims description 15
- 239000005708 Sodium hypochlorite Substances 0.000 claims description 14
- QAOWNCQODCNURD-UHFFFAOYSA-N Sulfuric acid Chemical compound OS(O)(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-N 0.000 claims description 14
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical group [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 claims description 14
- 239000013049 sediment Substances 0.000 claims description 12
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 10
- 239000002253 acid Substances 0.000 claims description 10
- 238000007599 discharging Methods 0.000 claims description 10
- 239000012024 dehydrating agents Substances 0.000 claims description 9
- ZKQDCIXGCQPQNV-UHFFFAOYSA-N Calcium hypochlorite Chemical compound [Ca+2].Cl[O-].Cl[O-] ZKQDCIXGCQPQNV-UHFFFAOYSA-N 0.000 claims description 8
- 239000003513 alkali Substances 0.000 claims description 8
- RBTARNINKXHZNM-UHFFFAOYSA-K iron trichloride Chemical compound Cl[Fe](Cl)Cl RBTARNINKXHZNM-UHFFFAOYSA-K 0.000 claims description 8
- 229910021578 Iron(III) chloride Inorganic materials 0.000 claims description 7
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 claims description 7
- SURQXAFEQWPFPV-UHFFFAOYSA-L iron(2+) sulfate heptahydrate Chemical compound O.O.O.O.O.O.O.[Fe+2].[O-]S([O-])(=O)=O SURQXAFEQWPFPV-UHFFFAOYSA-L 0.000 claims description 7
- 229910000359 iron(II) sulfate Inorganic materials 0.000 claims description 7
- 229920002401 polyacrylamide Polymers 0.000 claims description 6
- 238000005086 pumping Methods 0.000 claims description 6
- VEXZGXHMUGYJMC-UHFFFAOYSA-M Chloride anion Chemical compound [Cl-] VEXZGXHMUGYJMC-UHFFFAOYSA-M 0.000 claims description 5
- 229960002089 ferrous chloride Drugs 0.000 claims description 5
- NMCUIPGRVMDVDB-UHFFFAOYSA-L iron dichloride Chemical compound Cl[Fe]Cl NMCUIPGRVMDVDB-UHFFFAOYSA-L 0.000 claims description 5
- RMAQACBXLXPBSY-UHFFFAOYSA-N silicic acid Chemical class O[Si](O)(O)O RMAQACBXLXPBSY-UHFFFAOYSA-N 0.000 claims description 5
- 125000000129 anionic group Chemical group 0.000 claims description 3
- 125000002091 cationic group Chemical group 0.000 claims description 3
- 239000003795 chemical substances by application Substances 0.000 claims description 3
- 238000004065 wastewater treatment Methods 0.000 abstract description 18
- 230000000694 effects Effects 0.000 abstract description 15
- 239000003344 environmental pollutant Substances 0.000 abstract description 13
- 231100000719 pollutant Toxicity 0.000 abstract description 13
- 239000003153 chemical reaction reagent Substances 0.000 abstract description 10
- 239000000243 solution Substances 0.000 description 24
- 238000000354 decomposition reaction Methods 0.000 description 10
- 239000010452 phosphate Substances 0.000 description 10
- 238000001556 precipitation Methods 0.000 description 10
- 239000012028 Fenton's reagent Substances 0.000 description 9
- 229910019142 PO4 Inorganic materials 0.000 description 9
- 230000003311 flocculating effect Effects 0.000 description 8
- 230000001376 precipitating effect Effects 0.000 description 8
- 239000000126 substance Substances 0.000 description 8
- 238000007254 oxidation reaction Methods 0.000 description 6
- NBIIXXVUZAFLBC-UHFFFAOYSA-K phosphate Chemical compound [O-]P([O-])([O-])=O NBIIXXVUZAFLBC-UHFFFAOYSA-K 0.000 description 6
- ZAMOUSCENKQFHK-UHFFFAOYSA-N Chlorine atom Chemical compound [Cl] ZAMOUSCENKQFHK-UHFFFAOYSA-N 0.000 description 5
- 239000000460 chlorine Substances 0.000 description 5
- 229910052801 chlorine Inorganic materials 0.000 description 5
- 239000003814 drug Substances 0.000 description 5
- 238000005189 flocculation Methods 0.000 description 5
- 230000016615 flocculation Effects 0.000 description 5
- 230000003647 oxidation Effects 0.000 description 5
- VHUUQVKOLVNVRT-UHFFFAOYSA-N Ammonium hydroxide Chemical compound [NH4+].[OH-] VHUUQVKOLVNVRT-UHFFFAOYSA-N 0.000 description 4
- 208000005156 Dehydration Diseases 0.000 description 4
- 235000011114 ammonium hydroxide Nutrition 0.000 description 4
- 230000018044 dehydration Effects 0.000 description 4
- 238000006297 dehydration reaction Methods 0.000 description 4
- 238000003825 pressing Methods 0.000 description 4
- 238000011268 retreatment Methods 0.000 description 4
- 159000000007 calcium salts Chemical class 0.000 description 3
- 229940079593 drug Drugs 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000002244 precipitate Substances 0.000 description 3
- 239000005955 Ferric phosphate Substances 0.000 description 2
- 238000005273 aeration Methods 0.000 description 2
- 229910052782 aluminium Inorganic materials 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 2
- BRPQOXSCLDDYGP-UHFFFAOYSA-N calcium oxide Chemical compound [O-2].[Ca+2] BRPQOXSCLDDYGP-UHFFFAOYSA-N 0.000 description 2
- 239000000292 calcium oxide Substances 0.000 description 2
- ODINCKMPIJJUCX-UHFFFAOYSA-N calcium oxide Inorganic materials [Ca]=O ODINCKMPIJJUCX-UHFFFAOYSA-N 0.000 description 2
- 238000002144 chemical decomposition reaction Methods 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 229940032958 ferric phosphate Drugs 0.000 description 2
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 2
- WBJZTOZJJYAKHQ-UHFFFAOYSA-K iron(3+) phosphate Chemical compound [Fe+3].[O-]P([O-])([O-])=O WBJZTOZJJYAKHQ-UHFFFAOYSA-K 0.000 description 2
- RUTXIHLAWFEWGM-UHFFFAOYSA-H iron(3+) sulfate Chemical compound [Fe+3].[Fe+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O RUTXIHLAWFEWGM-UHFFFAOYSA-H 0.000 description 2
- 229910000399 iron(III) phosphate Inorganic materials 0.000 description 2
- 229910000360 iron(III) sulfate Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000002957 persistent organic pollutant Substances 0.000 description 2
- 239000011734 sodium Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 239000002699 waste material Substances 0.000 description 2
- BHPQYMZQTOCNFJ-UHFFFAOYSA-N Calcium cation Chemical group [Ca+2] BHPQYMZQTOCNFJ-UHFFFAOYSA-N 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- AZDRQVAHHNSJOQ-UHFFFAOYSA-N alumane Chemical class [AlH3] AZDRQVAHHNSJOQ-UHFFFAOYSA-N 0.000 description 1
- DIZPMCHEQGEION-UHFFFAOYSA-H aluminium sulfate (anhydrous) Chemical compound [Al+3].[Al+3].[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O.[O-]S([O-])(=O)=O DIZPMCHEQGEION-UHFFFAOYSA-H 0.000 description 1
- 230000000844 anti-bacterial effect Effects 0.000 description 1
- 239000003899 bactericide agent Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 1
- 239000004327 boric acid Substances 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 239000013043 chemical agent Substances 0.000 description 1
- 238000009388 chemical precipitation Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000007123 defense Effects 0.000 description 1
- 230000000593 degrading effect Effects 0.000 description 1
- 238000007865 diluting Methods 0.000 description 1
- 238000010790 dilution Methods 0.000 description 1
- 239000012895 dilution Substances 0.000 description 1
- 238000003113 dilution method Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- MGZTXXNFBIUONY-UHFFFAOYSA-N hydrogen peroxide;iron(2+);sulfuric acid Chemical compound [Fe+2].OO.OS(O)(=O)=O MGZTXXNFBIUONY-UHFFFAOYSA-N 0.000 description 1
- 239000010842 industrial wastewater Substances 0.000 description 1
- BAUYGSIQEAFULO-UHFFFAOYSA-L iron(2+) sulfate (anhydrous) Chemical compound [Fe+2].[O-]S([O-])(=O)=O BAUYGSIQEAFULO-UHFFFAOYSA-L 0.000 description 1
- 229910000155 iron(II) phosphate Inorganic materials 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002156 mixing Methods 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 125000002467 phosphate group Chemical group [H]OP(=O)(O[H])O[*] 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 239000002354 radioactive wastewater Substances 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000001488 sodium phosphate Substances 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- RYFMWSXOAZQYPI-UHFFFAOYSA-K trisodium phosphate Chemical compound [Na+].[Na+].[Na+].[O-]P([O-])([O-])=O RYFMWSXOAZQYPI-UHFFFAOYSA-K 0.000 description 1
- 229910000406 trisodium phosphate Inorganic materials 0.000 description 1
- 235000019801 trisodium phosphate Nutrition 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Images
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F9/00—Multistage treatment of water, waste water or sewage
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/5236—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents
- C02F1/5245—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using inorganic agents using basic salts, e.g. of aluminium and iron
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/52—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities
- C02F1/54—Treatment of water, waste water, or sewage by flocculation or precipitation of suspended impurities using organic material
- C02F1/56—Macromolecular compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/722—Oxidation by peroxides
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/72—Treatment of water, waste water, or sewage by oxidation
- C02F1/725—Treatment of water, waste water, or sewage by oxidation by catalytic oxidation
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/006—Radioactive compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/10—Inorganic compounds
- C02F2101/105—Phosphorus compounds
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2305/00—Use of specific compounds during water treatment
- C02F2305/02—Specific form of oxidant
- C02F2305/026—Fenton's reagent
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- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Treatment Of Water By Oxidation Or Reduction (AREA)
Abstract
The invention discloses a method for treating debugging wastewater in a nuclear power construction phase, which comprises the following steps: s1, first phosphorus removal and Fenton reaction: the wastewater enters a first-stage Fenton reaction tank, the pH value is adjusted, and ferric ions, hydrogen peroxide and ferrous ions are added; entering a first-stage Fenton reaction sedimentation tank, adjusting the pH value, and adding a coagulant aid and a coagulant; s2, carrying out phosphorus removal and Fenton reaction for the second time: the treated wastewater enters a secondary Fenton reaction tank, the pH value is adjusted, and ferric ions, hydrogen peroxide and ferrous ions are added; entering a secondary Fenton reaction sedimentation tank, adjusting the pH value, and adding a coagulant aid and a coagulant; s3, deeply decomposing ammonia nitrogen: the treated wastewater enters a water outlet pool, and a strong oxidant is added. The invention has the advantages of low reagent cost, convenient dosing, reduced manual interference, high automation degree, convenient operation in the water treatment process, remarkable wastewater treatment effect and no generation of new pollutants, and adopts liquid reagents in the whole process.
Description
Technical Field
The invention relates to the technical field of nuclear power wastewater treatment, in particular to a debugging wastewater treatment method in a nuclear power construction phase.
Background
During the construction of nuclear power projects, chemical agents such as trisodium phosphate, hydrazine, ammonia water, boric acid and the like are required to be added to a nuclear island and a conventional island I loop pipe network and a conventional island II loop pipe network for equipment maintenance and water quality regulation, a large amount of chemical dosing wastewater is required to be discharged in a system debugging stage, and production wastewater is required to meet the first-level standard of Integrated wastewater discharge Standard (GB 8978-1996) according to the latest non-radioactive wastewater requisition standard document and then is discharged, so the dosing wastewater discharged in a unit debugging stage is required to be treated and discharged after reaching the standard.
According to the construction experience of the previous nuclear power project, the chemical-adding wastewater discharged in the debugging stage is discharged in a standard-reaching manner in an in-plant circulation manner, and the chemical-adding wastewater discharged in the debugging stage is not specially treated, so that the debugging wastewater treatment project is still blank in the nuclear power construction field.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a method for treating debugging wastewater in a nuclear power construction phase, aiming at the defects of the prior art.
The technical scheme adopted by the invention for solving the technical problems is as follows: a method for treating debugging wastewater in a nuclear power construction phase comprises the following steps:
s1, first phosphorus removal and Fenton reaction: the wastewater enters a first-stage Fenton reaction tank, acid liquid is added for the first time to adjust the pH value to 2-4, and ferric ions, hydrogen peroxide and ferrous ions are added; entering a first-stage Fenton reaction sedimentation tank, adding alkali liquor for the first time to adjust the pH value to 7-9, and adding a coagulant aid and a coagulant;
s2, carrying out phosphorus removal and Fenton reaction for the second time: the wastewater treated in the step S1 enters a secondary Fenton reaction tank, acid liquid is added for the second time to adjust the pH value to 2-4, and ferric ions, hydrogen peroxide and ferrous ions are added; entering a secondary Fenton reaction sedimentation tank, adding alkali liquor for the second time to adjust the pH value to 7-9, and adding a coagulant aid and a coagulant;
s3, deeply decomposing ammonia nitrogen: and (3) the wastewater treated in the step (S2) enters a water outlet pool, and is treated by adding a strong oxidant, and then the standard-reaching water is discharged.
Preferably, the acid solution is sulfuric acid or hydrochloric acid, and the alkali solution is sodium hydroxide or potassium hydroxide.
Preferably, the ferrous ion is copperas or ferrous chloride, and the ferric ion is ferric chloride or polyferric sulfate.
Preferably, in the steps S1 and S2, based on 30L of wastewater with the hydrazine content of 1g/L, 150-200mL of hydrogen peroxide with the mass concentration of 25-30% is added, and 450-550mL of ferrous ion solution with the mass concentration of 25-30% is added.
Preferably, in the S1 and S2 steps, 80-90mL of iron ion solution with mass concentration of 18-22% is added based on 1L of wastewater with total phosphorus content of 5 mg/L.
Preferably, the coagulant aid is anionic polyacrylamide or activated silicic acid, and the coagulant is polyaluminium chloride or polyaluminium sulfate.
Preferably, in the S1 and S2 steps, 150-200mL of coagulant aid with the mass concentration of 0.05-0.15% is added based on 30L of wastewater.
Preferably, in the steps S1 and S2, 35-40mL of coagulant with the mass concentration of 5-15% is added based on 30L of wastewater.
Preferably, the strong oxidant is sodium hypochlorite or calcium hypochlorite.
Preferably, in the step S3, 150-200mL of strong oxidant with the mass concentration of 8-12% is added based on 30L of wastewater.
Preferably, the method further comprises the step S4 of dehydrating: and discharging the sediments after the water is discharged from the first-stage Fenton reaction sedimentation tank and the second-stage Fenton reaction sedimentation tank to a sludge concentration tank, pumping the sediments into a sludge dewatering machine, and adding a dewatering agent to dewater and press cakes.
Preferably, the dehydrating agent is cationic polyacrylamide.
Preferably, based on 30L of wastewater, 150-200mL of dehydrating agent with the mass concentration of 0.05-0.15% is added.
The invention has the beneficial effects that:
the invention provides a wastewater treatment method for debugging in a nuclear power construction phase, which fully combines the characteristics of discharged wastewater, utilizes Fenton reaction to treat chemical pollutants such as hydrazine and the like in the wastewater, and generates iron ions in the oxidation process due to the fact that the Fenton reaction is generated by adding hydrogen peroxide and ferrous ions into the wastewater, so that the method has the effect of flocculation and precipitation and also accelerates the effective decomposition of phosphate in the wastewater. Compared with the mode of adding calcium salt to treat phosphate in the market, the method has the advantages that iron ions are added to effectively treat the phosphate, precipitates such as iron ions can be continuously produced in the hydrazine removing process, the flocculation effect in waste water is guaranteed, and the purpose of effectively treating the phosphate while efficiently decomposing hydrazine is achieved. In addition, the invention also adds strong oxidant in the water outlet pool to deeply decompose ammonia nitrogen, so as to promote the wastewater discharge to reach the standard.
The reagent of the invention has low cost, adopts liquid reagent in the whole process, is convenient for dosing, reduces manual interference, has high automation degree and is convenient for operation in the water treatment process. The invention has the advantages that the water quality reaches the standard after the wastewater is treated, the treatment effect is obvious, and no new pollutant is generated because the added reagent completely reacts with the pollutant in the water.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic view of a wastewater treatment process according to the present invention.
Detailed Description
In order to clearly understand the technical features, objects and effects of the present invention, the present invention will be further described in detail with reference to the following embodiments, which are only used for explaining the present invention and are not to be construed as limiting the scope of the present invention.
The main pollutant component of the wastewater discharged in the debugging process of the nuclear power construction stage is Na 3 PO 4 Suspended matter, ammonia water, hydrazine, etc., wherein Na 3 PO 4 The concentration limit value is 100-500 mg/L, the empirical value is about 200mg/L, the maximum pH value of the discharged ammonia water is 9.9, and the hydrazine is 0.3-500 mg/L. The actual influent quality at the wastewater treatment plant at the commissioning stage is shown in table 1.
TABLE 1 debugging Water quality index of wastewater treatment station
According to the first-class standard of Integrated wastewater discharge Standard (GB 8978-1996), the requirements of effluent quality after the treatment of production wastewater are shown in Table 2:
TABLE 2 adjustment of effluent quality standard after wastewater treatment
The treatment method for high-concentration hydrazine mainly comprises dilution, standing natural decomposition, aeration accelerated decomposition and chemical accelerated decomposition. Among other things, the main problem with the dilution method is that large amounts of water containing no or low concentrations of hydrazine are required and the harm of hydrazine is not really eliminated. The main problems of the standing natural decomposition method and the aeration accelerated decomposition method are that a large amount of storage equipment is needed for storing the waste water containing high-concentration hydrazine for a long time, but the decomposition rate of the hydrazine under natural conditions is extremely low, and the high-concentration hydrazine is easy to volatilize, so that the risk of local aggregation exists. The chemical decomposition method is feasible, but the effect of other chemical decomposition processes is not obvious due to overhigh hydrazine concentration in the wastewater discharged in the nuclear power debugging stage.
The invention adopts a Fenton oxidation method to decompose hydrazine, and the Fenton advanced oxidation technology generally refers to a treatment method for oxidizing and degrading organic pollutants by generating hydroxyl free radicals (. OH) with high reaction activity at ambient temperature or pressure, and the organic pollutants are oxidized and degraded by adding hydrogen peroxide and ferrous salt into wastewater and reacting in pH 2-4 to generate the hydroxyl free radicals (. OH) with strong oxidizing property. The process flow of the Fenton oxidation wastewater treatment project mainly comprises acid regulation, catalyst mixing, oxidation reaction, neutralization, solid-liquid separation, medicament dosing and a sludge treatment system. Fenton's reagent (i.e. H) 2 O 2 And Fe 2+ ) Has strong oxidizing power because of H 2 O 2 Quilt Fe 2+ The key of Fenton reaction lies in that the ferrous ions play a role in excitation and transmission in the reaction, so that the chain reaction can continue until the hydrogen peroxide is exhausted. In addition, since the fenton reagent generates iron water complex when treating organic wastewater, it indicates that the fenton reagent has a flocculation function, and this function enables the fenton reagent to degrade COD value.
The invention selects a chemical precipitation dephosphorization process, and common medicaments are ferric salt, aluminum salt and calcium salt. Wherein, when the aluminum ions are used for water treatment, secondary pollution, namely heavy metal aluminum ion residue, is easily caused; the calcium salt is easy to increase the pH value of the wastewater, and the calcium ion residue is unfavorable for removing ammonia nitrogen in the wastewater treated by a precipitation method subsequently, and can also reduce the automation degree of the system; the ferric phosphate begins to precipitate when the pH value is more than 2, and the Ksp (precipitation equilibrium constant, solubility product for short) of ferrous ions and phosphate radicals is 1.1 multiplied by 10 -10 The Ksp of iron ion and phosphate radical is 1.3X 10 -22 . Therefore, the phosphorus is removed by adopting the iron ions, the iron ions are not easy to remain, and the combination of the iron ions and phosphate radical is more stable.In addition, as the pH value of the inlet water is increased, the adding amount of the ferric chloride is also increased.
The invention provides a method for treating debugging wastewater in a nuclear power construction phase, which comprises the following steps of:
s1, first phosphorus removal and Fenton reaction, comprising the following substeps:
s1.1, dephosphorization and Fenton reaction: the wastewater enters a first-stage Fenton reaction sedimentation tank, acid liquid is added for the first time to adjust the pH value to 2-4, and 80-90mL of iron ion solution with the mass concentration of 18-22% is added for dephosphorization based on 1L of wastewater with the total phosphorus content of 5 mg/L; adding 150-200mL of hydrogen peroxide with the mass concentration of 25-30% and 450-550mL of ferrous ion solution with the mass concentration of 25-30% based on 30L of wastewater with the hydrazine content of 1g/L to decompose hydrazine;
s1.2, flocculating and precipitating: and (2) the wastewater treated in the step S1.1 enters a first-stage Fenton reaction tank, alkaline liquor is added for the first time to adjust the pH value to 7-9, and 150-200mL of coagulant aid with the mass concentration of 0.05-0.15% and 35-40mL of coagulant aid with the mass concentration of 5-15% are added based on 30L of wastewater to generate precipitate.
S2, carrying out secondary phosphorus removal and Fenton reaction, and comprising the following substeps:
s2.1, dephosphorization and Fenton reaction: the wastewater treated in the step S1.2 enters a secondary Fenton reaction tank, acid liquor is added for the second time to adjust the pH value to 2-4, and 80-90mL of iron ion solution with the mass concentration of 18-22% is added for dephosphorization based on 1L of wastewater with the total phosphorus content of 5 mg/L; adding 150-200mL of hydrogen peroxide with the mass concentration of 25-30% and 450-550mL of ferrous ion solution with the mass concentration of 25-30% into 30L of wastewater with the hydrazine content of 1g/L to decompose hydrazine;
s2.2, flocculating and precipitating: and (2) the wastewater treated in the step (S2.1) enters a secondary Fenton reaction sedimentation tank, alkali liquor is added for the second time to adjust the pH value to 7-9, and 150-200mL of coagulant aid with the mass concentration of 0.05-0.15% and 35-40mL of coagulant with the mass concentration of 5-15% are added based on 30L of wastewater to generate sedimentation.
Wherein the acid solution is sulfuric acid or hydrochloric acid, the alkali solution is sodium hydroxide or potassium hydroxide, the ferrous ion is copperas or ferrous chloride, the ferric ion is ferric chloride or polymeric ferric sulfate, the coagulant aid is Anionic Polyacrylamide (APAM) or activated silicic acid, and the coagulant is polyaluminium chloride (PAC) or polyaluminium sulfate. In the Fenton reagent, the mass adding ratio of hydrazine to hydrogen peroxide is 1.76, and the molar adding ratio of hydrogen peroxide to ferrous ions is 3:1. In addition, the dosage of the iron ion solution, coagulant aid and coagulant aid comprises 25% of design allowance.
The optimal pH value of the phosphate precipitation is about 4, but the pH value is adjusted to 2-4 in the dephosphorization process, the pH value is increased due to hydrazine and the like in the wastewater, and the pH value needs to be slightly adjusted to be lower according to actual conditions in order to prevent the pH value from being too high.
S3, deeply decomposing ammonia nitrogen: and 2.2, enabling the treated wastewater in the step 2.2 to enter a strong oxidant adding area in a water outlet pool, adding 150-200mL of strong oxidant with the mass concentration of 8-12% based on 30L of wastewater for treatment, detecting the quality of the effluent, discharging qualified water if the quality of the effluent meets the standard, and returning the effluent to the water inlet pipe of the first-stage Fenton reaction pool for retreatment if the quality of the effluent does not meet the standard.
The strong oxidant is sodium hypochlorite or calcium hypochlorite, has good effect in treating hydrazine, can effectively promote the decomposition of the hydrazine compared with hydrogen peroxide, and cannot cause secondary pollution of drainage, so that a small amount of sodium hypochlorite or calcium hypochlorite is added to assist in deeply decomposing ammonia nitrogen under the condition that the index of the ammonia nitrogen in effluent exceeds the standard. However, in the integrated wastewater discharge standard (GB 8978-1996), control of residual chlorine is required, and too high a concentration of chloride ions leads to increased requirements for the material of the subsequent equipment and increased production costs. Therefore, selection of sodium hypochlorite or calcium hypochlorite for accelerating the decomposition of hydrazine requires strict control of the amount of sodium hypochlorite or calcium hypochlorite added. The standard makes the index of residual chlorine clear as the requirement for sewage discharge in hospitals and the like, but the industrial wastewater is not clear, but the invention controls the residual chlorine within 0.5mg/L according to the national standard. Adding 10% sodium hypochlorite into 30m 3 The content of residual chlorine at the outlet can be ensured to be less than 0.5mg/L by diluting sodium hypochlorite by 20 times based on the wastewater with flow/h, so the addition amount of the sodium hypochlorite needs to be less than 1.5m 3 The invention adopts 8-12% of sodium hypochlorite or calcium hypochlorite, and the addition amount is controlled to be less than 0.2m 3 And h, so that the residual chlorine content of the effluent after the wastewater is treated meets the discharge standard.
S4, dehydration treatment: discharging the sediments after the water is discharged from the first-stage Fenton reaction sedimentation tank and the second-stage Fenton reaction sedimentation tank to a sludge concentration tank, pumping the sediments into a sludge dewatering machine, adding 150-200mL of dewatering agent with the mass concentration of 0.05-0.15% based on 30L of waste water, and dewatering and pressing cakes.
The dehydrating agent of the invention can select ferric trichloride, polymeric ferric sulfate, aluminum sulfate and the like theoretically, but the components all play a role of flocculation precipitation, so the dehydrating agent is not generally used as a sludge dehydrating agent, and the using amount is large, and new pollutants are generated. Therefore, the dehydrating agent of the invention is selected from Cationic Polyacrylamide (CPAM).
The adding amount of the reagent in the wastewater treatment method is calculated according to the specific content of specific pollutants in the wastewater, wherein the adding amount of the Fenton reagent (namely hydrogen peroxide and ferrous ions) is calculated according to the content of hydrazine in the wastewater; in the dephosphorization process, the dosage of the iron ions is calculated according to the total phosphorus content in the wastewater, and the dosage of the coagulant aid, the coagulant and the bactericide is calculated according to the water inflow. The reagent dosage is designed according to the pollutant content, the pollutant in the wastewater can be efficiently removed, and the waste of dosing or poor treatment effect is avoided.
The design adding amount of the Fenton reagent, the iron ions, the coagulant aid and the strong oxidant in the wastewater treatment method is theoretical calculated values, and as the pH value of the wastewater to be added discharged in the debugging stage during the construction period of a nuclear power project is uncertain, the on-site adding amount needs to be specifically adjusted according to the actual pH value of the incoming water, and the water quality is ensured to be adjusted to the proper pH value before adding the drugs so as to achieve the optimal reaction effect. The actual dosage of the dehydrating agent is adjusted according to the specific dehydrating condition.
The invention adopts a chemical phosphorus removal and Fenton reagent hydrazine decomposition process, carries out targeted treatment measures according to the components of the drug-added wastewater generated in the construction and debugging stage of a nuclear power project, decomposes hydrazine by adding hydrogen peroxide and ferrous ions, removes phosphate by adding ferric ions, and achieves the flocculation effect of suspended matters in the wastewater by adjusting the pH value. In addition, iron ions are generated in the Fenton reaction process, so that the generation of ferric phosphate precipitates in the subsequent phosphorus removal reaction is promoted, and the wastewater treatment effect is improved.
Calcium oxide is used for removing phosphorus and sodium hypochlorite is used for removing hydrazine in the conventional wastewater treatment method, but the calcium oxide is used and needs to be carried manually, so that the labor cost is increased, and the concentration of chloride ions in water is too high when the sodium hypochlorite is used. The method selects the Fenton reagent to remove the hydrazine and the iron ion solution for dephosphorization, has low reagent cost, adopts the liquid reagent in the whole process, is convenient to dose, reduces the manual interference, ensures that the whole treatment project is in a liquid flowing state, has high automation degree, and is convenient for running and operation in the water treatment process. The invention has the advantages that the water quality reaches the standard after the wastewater is treated, the treatment effect is obvious, and no new pollutant is generated because the added reagent completely reacts with the pollutant in the water.
The following is illustrated by way of specific examples:
example 1
The invention provides a method for treating debugging wastewater in a nuclear power construction phase, which comprises the following steps:
s1, first phosphorus removal and Fenton reaction, comprising the following substeps:
s1.1, dephosphorization and Fenton reaction: the wastewater enters a first-stage Fenton reaction tank, sulfuric acid is added for the first time to adjust the pH value to 3, and 85.18mL of ferric chloride solution with the mass concentration of 20% is added based on 1L of wastewater with the total phosphorus content of 5 mg/L; based on 30L of wastewater with the hydrazine content of 1g/L, 168.21mL of hydrogen peroxide with the mass concentration of 27.5 percent and 508.81mL of copperas solution with the mass concentration of 28 percent are added;
s1.2, flocculating and precipitating: and (3) the wastewater treated in the step S1.1 enters a primary Fenton reaction sedimentation tank, sodium hydroxide is added for the first time to adjust the pH value to 8, and 187.5mL of APAM with the mass concentration of 0.1% and 37.5mL of PAC with the mass concentration of 10% are added based on 30L of wastewater to generate sedimentation.
S2, carrying out secondary phosphorus removal and Fenton reaction, and comprising the following substeps:
s2.1, dephosphorization and Fenton reaction: the wastewater treated in the step S1.2 enters a secondary Fenton reaction tank, sulfuric acid is added for the second time to adjust the pH value to 3, and 85.18mL of iron ion solution with the mass concentration of 18-22% is added based on 1L of wastewater with the total phosphorus content of 5 mg/L; based on 30L of wastewater with the hydrazine content of 1g/L, adding 167mL of hydrogen peroxide with the mass concentration of 27.5 percent and 504mL of copperas solution with the mass concentration of 28 percent;
s2.2, flocculating and precipitating: and (3) the wastewater treated in the step S2.1 enters a secondary Fenton reaction sedimentation tank, sodium hydroxide is added for the second time to adjust the pH value to 8, and 187.5mL of APAM with the mass concentration of 0.1% and 37.5mL of PAC with the mass concentration of 10% are added based on 30L of wastewater to generate sedimentation.
S3, deeply decomposing ammonia nitrogen: and 2.2, enabling the treated wastewater in the step 2.2 to enter a strong oxidant adding area in a water outlet pool, adding 167.23mL of sodium hypochlorite with the mass concentration of 10% in terms of 30L of wastewater for treatment, detecting the quality of the effluent, discharging water reaching the standard if the water quality reaches the standard, and returning the effluent to the water inlet pipe of the first-stage Fenton reaction pool for retreatment if the water quality does not reach the standard.
S4, dehydration treatment: discharging the sediments after the water outlet of the first-stage Fenton reaction sedimentation tank and the second-stage Fenton reaction sedimentation tank to a sludge concentration tank, pumping the sediments into a sludge dewatering machine, adding 187.5mL of CPAM with the mass concentration of 0.1 percent based on 30L of waste water, and dewatering and pressing cakes.
Example 2
The invention provides a method for treating debugging wastewater in a nuclear power construction phase, which comprises the following steps:
s1, first phosphorus removal and Fenton reaction, comprising the following substeps:
s1.1, dephosphorization and Fenton reaction: the wastewater enters a first-stage Fenton reaction tank, hydrochloric acid is added for the first time to adjust the pH value to 2, and 80mL of ferric chloride solution with the mass concentration of 22% is added based on 1L of wastewater with the total phosphorus content of 5 mg/L; adding 150mL of hydrogen peroxide with the mass concentration of 30% and 450mL of ferrous chloride solution with the mass concentration of 30% based on 30L of wastewater with the hydrazine content of 1 g/L;
s1.2, flocculating and precipitating: and (2) the wastewater treated in the step S1.1 enters a first-stage Fenton reaction sedimentation tank, potassium hydroxide is added for the first time to adjust the pH value to 7, and 150mL of activated silicic acid with the mass concentration of 0.15% and 35mL of polyaluminum sulfate with the mass concentration of 15% are added based on 30L of wastewater to generate precipitation dephosphorization.
S2, carrying out secondary phosphorus removal and Fenton reaction, and comprising the following substeps:
s2.1, dephosphorization and Fenton reaction: the wastewater treated in the step S1.2 enters a secondary Fenton reaction tank, hydrochloric acid is added for the second time to adjust the pH value to 2, and 80mL of iron ion solution with the mass concentration of 22% is added based on 1L of wastewater with the total phosphorus content of 5 mg/L; adding 150mL of hydrogen peroxide with the mass concentration of 30% and 450mL of ferrous chloride solution with the mass concentration of 30% based on 30L of wastewater with the hydrazine content of 1 g/L;
s2.2, flocculating and precipitating: and (2) the wastewater treated in the step (S2.1) enters a secondary Fenton reaction sedimentation tank, potassium hydroxide is added for the second time to adjust the pH value to 7, and 150mL of activated silicic acid with the mass concentration of 0.15% and 35mL of polyaluminum sulfate with the mass concentration of 15% are added based on 30L of wastewater to generate precipitation dephosphorization.
S3, deeply decomposing ammonia nitrogen: and (2) allowing the wastewater treated in the step (2.2) to enter a strong oxidant adding area in a water outlet pool, adding 150mL of calcium hypochlorite with the mass concentration of 12% based on 30L of wastewater for treatment, detecting the quality of the effluent, discharging qualified water if the quality of the effluent meets the standard, and returning the effluent to a water inlet pipe of the primary Fenton reaction pool for retreatment if the quality of the effluent does not meet the standard.
S4, dehydration treatment: discharging the sediments after the water is discharged from the first-stage Fenton reaction sedimentation tank and the second-stage Fenton reaction sedimentation tank to a sludge concentration tank, pumping the sediments into a sludge dewatering machine, adding 150mL of CPAM with the mass concentration of 0.15% based on 30L of waste water, and dewatering and pressing cakes.
Example 3
The invention provides a method for treating debugging wastewater in a nuclear power construction phase, which comprises the following steps:
s1, first phosphorus removal and Fenton reaction, comprising the following substeps:
s1.1, dephosphorization and Fenton reaction: the wastewater enters a first-stage Fenton reaction tank, sulfuric acid is added for the first time to adjust the pH value to 4, and 90mL of ferric chloride solution with the mass concentration of 18 percent is added based on 1L of wastewater with the total phosphorus content of 5 mg/L; adding 200mL of hydrogen peroxide with the mass concentration of 25% and 550mL of copperas solution with the mass concentration of 25% into 30L of wastewater with the hydrazine content of 1 g/L;
s1.2, flocculating and precipitating: and (2) the wastewater treated in the step S1.1 enters a primary Fenton reaction sedimentation tank, sodium hydroxide is added for the first time to adjust the pH value to 9, and 200mL of APAM with the mass concentration of 0.05% and 40mL of PAC with the mass concentration of 5% are added based on 30L of wastewater to generate precipitation dephosphorization.
S2, carrying out secondary phosphorus removal and Fenton reaction, and comprising the following substeps:
s2.1, dephosphorization and Fenton reaction: the wastewater treated in the step S1.2 enters a secondary Fenton reaction tank, sulfuric acid is added for the second time to adjust the pH value to be 4, and 90mL of iron ion solution with the mass concentration of 18 percent is added based on 1L of wastewater with the total phosphorus content of 5 mg/L; adding 200mL of hydrogen peroxide with the mass concentration of 25% and 550mL of copperas solution with the mass concentration of 25% into 30L of wastewater with the hydrazine content of 1 g/L;
s2.2, flocculating and precipitating: and (2) the wastewater treated in the step (S2.1) enters a secondary Fenton reaction sedimentation tank, sodium hydroxide is added for the second time to adjust the pH value to 9, and 200mL of APAM with the mass concentration of 0.05% and 40mL of PAC with the mass concentration of 5% are added based on 30L of wastewater to generate precipitation dephosphorization.
S3, deeply decomposing ammonia nitrogen: and 2.2, enabling the treated wastewater in the step 2.2 to enter a strong oxidant adding area in a water outlet pool, adding 200mL of sodium hypochlorite with the mass concentration of 8% in terms of 30L of wastewater for treatment, detecting the quality of the outlet water, discharging the water reaching the standard if the water quality reaches the standard, and returning the water to the water inlet pipe of the primary Fenton reaction pool for retreatment if the water quality does not reach the standard.
S4, dehydration treatment: discharging the sediments after the water is discharged from the first-stage Fenton reaction sedimentation tank and the second-stage Fenton reaction sedimentation tank to a sludge concentration tank, pumping the sediments into a sludge dewatering machine, adding 200mL of CPAM with the mass concentration of 0.05 percent based on 30L of waste water, and dewatering and pressing cakes.
And (3) verification test:
the wastewater treatment method of example 1 of the invention is adopted to treat the debugging wastewater in the construction stage of nuclear power unit No. 3 in urban harbor defense, the comparison between the data before and after treatment and the drainage standard is shown in Table 3, and the drainage standard refers to the primary standard of Integrated wastewater discharge Standard (GB 8978-1996).
TABLE 3 comparison before and after wastewater treatment
According to the test results, through the chemical adding treatment of the wastewater treatment method, the main pollutants of phosphate, ammonia water and hydrazine in the wastewater are removed, and all indexes of pH, total phosphorus, ammonia nitrogen, hydrazine, suspended matters and COD value (chemical oxygen demand) are within the standard range and are lower than the standard limit value to a certain extent. Therefore, the method has a good treatment effect on the debugging wastewater in the nuclear power construction stage.
In conclusion, the invention provides a targeted staged and layered wastewater treatment method based on components of nuclear power debugging wastewater, which comprises the processes of removing phosphorus, removing hydrazine, reducing COD (chemical oxygen demand) value, adjusting pH value, reducing suspended matters and the like. The method comprises the steps of adding ferric ions to generate precipitation and dephosphorization, removing hydrazine by a Fenton oxidation method, decomposing ammonia nitrogen and reducing COD value to prevent the ammonia nitrogen from exceeding the standard by a strong oxidant and ferrous ions, adding a coagulant aid and a coagulant to reduce suspended matters, and carrying out outward treatment after dewatering treatment on sludge generated in the treatment process.
The invention relates to a special treatment scheme in the field of nuclear power debugging wastewater, which aims at designing a treatment method aiming at the characteristics of debugging wastewater, such as chemical components in water, phosphorus, hydrazine, content of the hydrazine and the like, and debugging the dosage of added drugs, so that the waste of added drugs or poor treatment effect is avoided, and pollutants in wastewater are removed efficiently at the same time, and the wastewater reaches related emission standards.
The above description is only an embodiment of the present invention, and is not intended to limit the scope of the present invention, and all equivalent structures or equivalent processes performed by the present invention or directly or indirectly applied to other related technical fields are also included in the scope of the present invention.
Claims (13)
1. A method for treating debugging wastewater in a nuclear power construction phase is characterized by comprising the following steps:
s1, first phosphorus removal and Fenton reaction: the wastewater enters a first-stage Fenton reaction tank, acid liquid is added for the first time to adjust the pH value to 2-4, and ferric ions, hydrogen peroxide and ferrous ions are added; entering a first-stage Fenton reaction sedimentation tank, adding alkali liquor for the first time to adjust the pH value to 7-9, and adding a coagulant aid and a coagulant;
s2, carrying out phosphorus removal and Fenton reaction for the second time: the wastewater treated in the step S1 enters a secondary Fenton reaction tank, acid liquid is added for the second time to adjust the pH value to 2-4, and ferric ions, hydrogen peroxide and ferrous ions are added; entering a secondary Fenton reaction sedimentation tank, adding alkali liquor for the second time to adjust the pH value to 7-9, and adding a coagulant aid and a coagulant;
s3, deeply decomposing ammonia nitrogen: and (3) the wastewater treated in the step (S2) enters a water outlet pool, and is treated by adding a strong oxidant, and then the standard-reaching water is discharged.
2. The method for treating wastewater generated during debugging in nuclear power construction stage according to claim 1, wherein the acid solution is sulfuric acid or hydrochloric acid, and the alkali solution is sodium hydroxide or potassium hydroxide.
3. The method for treating debugging wastewater in nuclear power construction stage of claim 1, wherein the ferrous ion is copperas or ferrous chloride, and the ferric ion is ferric chloride or polyferric sulfate.
4. The method for treating debugging wastewater in nuclear power construction phase according to claim 3, wherein in the steps S1 and S2, based on 30L of wastewater with 1g/L of hydrazine, 150-200mL of hydrogen peroxide with mass concentration of 25-30% and 450-550mL of ferrous ion solution with mass concentration of 25-30% are added.
5. The method for treating wastewater generated during debugging in nuclear power construction stage of claim 3, wherein in the steps S1 and S2, based on 1L of wastewater with a total phosphorus content of 5mg/L, 80-90mL of iron ion solution with a mass concentration of 18-22% is added.
6. The method for treating debugging wastewater in nuclear power construction stage according to claim 1, wherein the coagulant aid is anionic polyacrylamide or activated silicic acid, and the coagulant is polyaluminium chloride or polyaluminium sulfate.
7. The method for treating debugging waste water in the nuclear power construction phase as claimed in claim 6, wherein in the steps S1 and S2, based on 30L of waste water, 150-200mL of coagulant aid with the mass concentration of 0.05-0.15% is added.
8. The method for treating wastewater generated during debugging in nuclear power construction stage of claim 6, wherein in the steps S1 and S2, based on 30L of wastewater, 35-40mL of coagulant with mass concentration of 5-15% is added.
9. The method for treating wastewater generated during debugging in nuclear power construction stage of claim 1, wherein the strong oxidant is sodium hypochlorite or calcium hypochlorite.
10. The method for treating debugging wastewater in nuclear power construction phase according to claim 9, wherein in the step S3, 150 to 200mL of a strong oxidizing agent with a mass concentration of 8 to 12% is added based on 30L of wastewater.
11. The method for treating wastewater generated during debugging in nuclear power construction stage according to claim 1, further comprising step S4 of dehydrating: and discharging the sediments after the water is discharged from the first-stage Fenton reaction sedimentation tank and the second-stage Fenton reaction sedimentation tank to a sludge concentration tank, pumping the sediments into a sludge dewatering machine, and adding a dewatering agent to dewater and press cakes.
12. The method for treating debugging wastewater in nuclear power construction phase of claim 11, wherein the dehydrating agent is cationic polyacrylamide.
13. The method for treating debugging wastewater in nuclear power construction stage according to claim 12, characterized in that 150-200mL of dehydrating agent with mass concentration of 0.05-0.15% is added based on 30L of wastewater.
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